Post #41

The Unusual Suspects: Rheumatoid Arthritis & Hashimoto’s

Crone Intelligence Briefing · Filed under: Prime Mimics & Hormonal Imposters

The Unusual Suspects

In this series I’ll be investigating the common culprits that mimic peri/menopause. Unfortunately, these imposters make it hard to navigate hormonal changes and to even discover whether you’re actually in peri/menopause in the first place.

Fourth offender in the dock is…

RHEUMATOID ARTHRITIS (RA) / HASHIMOTO’S

We’ve all seen the endless medication ads on TV while you’re sitting eating your dinner, so you’ll be very aware of RA and Hashimoto’s. But unless you suffer from these conditions it’s hard to understand the impact they have. Let’s start with an explanation of what they are.

Rheumatoid Arthritis

This is a chronic autoimmune disease which causes the body's immune system to attack the synovial membranes (lining) of moveable joints. The result is painful inflammation, swelling, and morning stiffness that usually affects matching joints on both sides of the body. So, both hands, wrists or knees etc. Unlike osteoarthritis, which is caused by mechanical wear and tear, rheumatoid arthritis is a systemic condition which affects the entire body and not just a single organ. This is even more serious because inflammation can also affect other parts of the body, including the heart, lungs, eyes, and blood vessels. There’s no cure but if treated early medication can control joint damage and pain and allow sufferers to achieve remission.

Hashimoto’s

Full name, Hashimoto's disease, also known as Hashimoto's thyroiditis is a chronic autoimmune disorder where the immune system mistakenly attacks the thyroid gland. We’ve discussed this small butterfly-shaped gland (located at the base of the neck/throat) before in how it’s diseases also mimic perimenopause symptoms. Over time, the immune system's white blood cells and antibodies damage the thyroid tissue, often causing it to become underactive and leading to hypothyroidism. The disease progresses to goiter, fatigue, unexpected weight gain, chronic constipation, dry skin, hair thinning, and an increased sensitivity to cold. While Hashimoto's is a lifelong condition, it can be managed with thyroid hormone replacement medications.

Symptoms overlap

Rheumatoid Arthritis and perimenopause

Joint pain and stiffness: You get aching joints that make movement uncomfortable
Fatigue: No matter how much you rest you get you feel exhausted
Brain fog and cognition: Difficulty concentrating, memory lapses, and increased anxiety or irritability
Sleep difficulties: Aching joints or shifting hormones cause insomnia or disrupted sleep
Shared onset age: RA onset peaks between the ages of 40 and 60

Hashimoto’s and perimenopause

Fatigue: No matter how much you rest you get you feel exhausted
Weight gain and slow metabolism: Unexplained weight gain, mostly around the middle, and difficulty losing weight
Brain fog and cognition: Difficulty concentrating, memory lapses, trouble finding words
Mood changes: Heightened anxiety, sudden irritability, and depression
Hair and skin changes: Thinning hair, hair loss, brittle nails, very dry skin
Irregular periods: Heavy, irregular, or skipped periods
Sleep difficulties: Insomnia and poor sleep quality
Shared onset age: Peaks or worsens in women during their 40s and early 50s

By now you get the drift, autoimmune conditions and perimenopause are definite bedfellows. So here we have yet another reason for confusing doctors (not hard for the poor dears). It takes more in-depth diagnosis and not the default gaslighting.

Key differences between RA and perimenopause

With RA you see obvious, symmetrical swelling on both wrists or both knees for example, redness, and the joints feel warm to the touch. This doesn’t happen with perimenopausal joint pain, you won’t see swelling or feel heat.

RA stiffness is severe and usually lasts longer than 30 to 60 minutes after waking up unlike perimenopausal stiffness which gets better quickly once you get up and start moving.

Hot flashes and night sweats are exclusive to perimenopause due to dropping estrogen levels. As are irregular periods, lighter or heavier flows, and skipped cycles.

Key differences between Hashimoto’s and perimenopause

Perimenopause causes hot flashes and night sweats but Hashimoto’s usually causes severe cold intolerance like chronically cold, frozen hands and feet, or the inability to warm up.

Perimenopause can cause sudden heart palpitations. Advanced Hashimoto's (hypothyroidism) usually slows the slow heart rate (bradycardia) and causes sluggish reflexes.

Hashimoto’s drastically slows down digestion causing chronic constipation. Perimenopause can cause digestive changes but it doesn’t cause just severe constipation.

Hashimoto’s often causes an inflamed thyroid gland, which causes fullness in the neck, a visible goiter, or difficulty swallowing.

Why does perimenopause trigger autoimmune conditions?

During perimenopause, estrogen and progesterone levels fluctuate, predictability goes out of the window. As you know, the swings are wild and with those peaks and troughs the immune system gets thrown off balance. This matters because sudden drops in estrogen cause inflammation to rise (you can guess, estrogen keeps that at bay). This is bad news if you already have RA or Hashimoto’s autoimmune conditions, since the hormonal swings WILL trigger flares. For Hashimoto’s sufferers, thyroid antibodies increase, leading to worsening hypothyroid symptoms and fatigue. Women with rheumatoid arthritis may notice worsening joint pain and frequency.

Common autoimmune disease triggers in perimenopause

Big hormonal shifts: Fluctuations in estrogen and progesterone destabilize immune system regulation.

RA & Hashimoto's get triggered because estrogen directly modulates T-cells (or T lymphocytes, the white blood cells that originate in the bone marrow, mature in the thymus gland and destroy infected or abnormal cells) and antibody production. When it plummets, the immune system starts attacking itself. This includes attacking the thyroid gland in Hashimoto's or the synovial membranes of the joints in rheumatoid arthritis. Studies (see below) show that perimenopause is the ideal time for autoimmune conditions to get worse due to fluctuating estrogen levels.

Chronic stress and trauma: From career pressure to other life concerns all roads lead to raised cortisol.

RA & Hashimoto's get triggered because estrogen normally softens the body's stress response. As it declines, midlife stress boosts cortisol, shifting the immune system into a pro-inflammatory state. This accelerates the joint inflammation in rheumatoid arthritis and worsens the autoimmune attacks on the thyroid gland.

Diet and inflammatory foods: If you are genetically prone to autoimmune disease, eating gluten, dairy, and ultra-processed foods can trigger immune overactivation and make gut inflammation worse.

RA & Hashimoto's get triggered because tanking hormones weaken the tight junctions of the intestinal lining and alter the gut microbiome resulting in "leaky gut". This allows dietary antigens (foreign proteins and molecules that can trigger an immune response) to escape into the bloodstream. Because gluten resembles thyroid tissue molecules, the immune system attacks the thyroid, triggering or worsening Hashimoto's.

Infections: Viruses such as herpes, bacterial dysbiosis, and hidden infections place chronic stress on the body.

RA & Hashimoto's get triggered because the destabilized immune system struggles to keep viruses dormant. When they reactivate, the immune system creates antibodies that then react against the body's own tissues - as in the joint erosion of rheumatoid arthritis and the tissue destruction of Hashimoto's.

Environmental toxins: Daily exposure to xenoestrogens, heavy metals, pesticides, and mold toxins promotes inflammation and immune disruption.

RA & Hashimoto's get triggered because without estrogen shielding cells from oxidative stress, environmental toxins cause cellular damage. They alter the gut microbiome, and start changes that send the immune response to work against joints and thyroid tissue.

Sleep disruptions: Sleep issues affect 31% to 42% of perimenopausal women and acts as a serious physiological stressor.

RA & Hashimoto's get triggered because estrogen helps regulate deep, restorative sleep. In its absence, you get chronic sleep deprivation and weakened immune defenses. This prevents cellular repair, and amps up body-wide inflammation, making it a target for rheumatoid arthritis flare-ups and thyroid attack.

How do you know if it’s RA/Hashimoto’s or perimenopause?

By now you know what I’m going to say… testing.

Main diagnostic tests

For RA: Doctors look for inflammatory markers in the blood (CRP and ESR) and specific autoimmune proteins (Rheumatoid Factor and Anti-CCP)
For perimenopause: It’s the usual clinical diagnosis based on age and menstrual history. Tests for FSH and Estradiol are sometimes used to rule out other conditions
For Hashimoto's: Diagnosis is through blood tests that check TSH, Free T4, Free T3, and specific thyroid antibodies (TPO and TgAb)
For perimenopause: Again, it’s the usual clinical diagnosis based on age and menstrual history. Tests for FSH and Estradiol are sometimes used to rule out other conditions

How does estrogen impact the immune system?

Estrogen does more than just act as a reproductive hormone. It’s a powerful modulator of the immune system. It has receptors on all of the immune cells and has specific actions upon them. For example:

B-cells (B-lymphocytes): These are the white blood cells made in the bone marrow that spot foreign invaders and produce proteins called antibodies to deal with them. Estrogen stimulates them to produce more antibodies, boosting defense against infections.

T-cells (T-lymphocytes): Are immune cells matured in the thymus that directly destroy infected or cancerous cells and coordinate the overall immune response. Estrogen tells them to become helpers (Th2) that signal other cells rather than direct tissue destruction. Think of it as a promotion from henchman to mentor.

Macrophages: These are large scavenger cells that eat and digest cellular debris, foreign substances, and microbes. Estrogen pushes them toward an "M2" healing role, meaning they focus on clearing debris and repairing tissue rather than fueling aggressive inflammation. Think of this is a promotion from cleaner to peacemaker/healer.

Mast Cells: These cells containing granules rich in histamine and heparin. Estrogen can trigger them to burst (degranulate), releasing histamine into the surrounding tissue and worsening allergic reactions.

As you can see estrogen has a big impact on immunity. From influencing the chemical messengers that direct immune activity, to production of T cells that act as the brakes and prevent immune attacks. Estrogen has specific effects on women since they are dominated by the hormone and so they are more susceptible to autoimmune disorders than men. This also explains why their symptoms vary from different estrogen states during life.

In a high estrogen state - pregnancy, reproductive years, HRT, severe tissue inflammation is kept at bay. Pathogens are removed and antibody levels are high. In low estrogen states - menopause, postmenopause, or hysterectomy, declining estrogen leads to a drop in white blood cells, B-cells, and T-cells, alongside a rise in pro-inflammatory markers. This can result in a weaker defense against some infections, slower viral recovery, and an increased risk of joint aches or inflammatory flare-ups.

How to treat autoimmune conditions during perimenopause?

Treating autoimmune conditions during perimenopause takes a multifaceted approach that looks at both hormone fluctuations as well as the immune system dysfunction.

Hormones and medications

The first and most common strategy is hormone therapy which will corral declining estrogen and progesterone levels to reduce systemic inflammation, joint stiffness, and fatigue.

For localized issues such as vaginal dryness or urinary issues, low-dose vaginal estrogen provides relief without causing systemic absorption. This is important for conditions like lupus (a chronic autoimmune disease where your immune system mistakenly attacks healthy cells, tissues, and organs, leading to inflammation and damage). Alongside hormone support, medications such as NSAIDs, corticosteroids, DMARDs, or biologics are suggested to suppress the immune system. These can manage symptoms but won’t address the hormonal shifts that trigger the flare ups. This approach needs close monitoring by a rheumatologist, because changing hormone levels can trigger flares or affect medication effectiveness.

Nutrition and gut health

Gut health is another avenue to explore since around 70% of the immune system resides in the gut. The gut-associated lymphoid tissue (GALT), which is the largest mass of lymphoid tissue in the human body and is where immune cell activation happens. It’s where trillions of bacteria, viruses, and fungi in the gut microbiome train immune cells how to spot the difference between harmless food particles, beneficial microbes, and dangerous pathogens. Perimenopausal hormonal shifts that alter the gut microbiome can affect immune regulation. The anti-inflammatory or autoimmune protocol (AIP) which is a diet rich in omega-3 fatty acids, removing refined sugars, adding pre and probiotics, can protect the gut barrier and lower inflammation. Adding vitamin D, B12, magnesium, and curcumin can also support immune and bone health.

Combat accelerated bone loss common in both perimenopause and autoimmune diseases, by adding strength training and scheduling early DEXA (dual-energy X-ray absorptiometry) bone density scans that use low-dose X-rays to measure bone mineral density and strength.

Stress and lifestyle

Sleep is essential for immune repair and inflammation regulation; it helps curb the cortisol spikes that make systemic inflammation worse. It’s also the time when the glymphatic system (the brain's waste clearance network) flushes out toxic metabolic waste, such as amyloid-beta, using cerebrospinal fluid. This detoxification process activates during deep, non-REM sleep, when brain cells shrink to allow fluid to flow freely and wash away debris. Getting 7 to 9 hours of quality sleep and sleeping on your side promotes glymphatic detox.

Reduce stress through yoga, mindfulness, or therapy to calm the nervous and immune systems. Talk to someone professional.

Can HRT help RA/ Hashimoto's?

Yes, hormone replacement therapy (HRT) can improve RA symptoms. HRT can help reduce joint inflammation and bone loss without increasing the risk of flare ups, with transdermal patches or gels often preferred over oral pills to minimize clot risks.

If you have Hashimoto’s, careful management is needed because oral estrogen can interfere with the gut absorption of morning thyroid pills if taken too close together. Transdermal HRT avoids this problem. Estrogen can increase thyroid-binding proteins in the blood, lowering the body's available thyroid hormone so doctors have to adjust the thyroid medication.

So now you have the evidence, we deliberate for a second…

THE CRONE'S VERDICTUNUSUAL SUSPECT #4:
GUILTY AS CHARGED!